A PO BOX number can be less than or more than four digit. For post office boxes, the general rule is that each box has its own ZIP+4 code.
The last four digit is often one of the following:
1. Zero plus the last three digits of the box number (eg. PO BOX 1001, Los Angeles CA 90001-0001).
2. The last four digits of the box number (eg. PO BOX 9991, Twin Peaks CA 92391-9991).
3. If the box number is less than four digits, enough zeros prepended to the front of the box number to produce a four-digit number(eg. PO BOX 1, Shreveport LA 71161-0001).
However, there is no uniform rule, the zip code plus four is for reference only, the ZIP+4 code must be looked up individually for each box in the USPS offical website.
PO BOX 50481, IDAHO FALLS, ID 83405-0481
PO BOX 50482, IDAHO FALLS, ID 83405-0482
PO BOX 50483, IDAHO FALLS, ID 83405-0483
PO BOX 50484, IDAHO FALLS, ID 83405-0484
PO BOX 50485, IDAHO FALLS, ID 83405-0485
PO BOX 50486, IDAHO FALLS, ID 83405-0486
PO BOX 50487, IDAHO FALLS, ID 83405-0487
PO BOX 50488, IDAHO FALLS, ID 83405-0488
PO BOX 50489, IDAHO FALLS, ID 83405-0489
PO BOX 50490, IDAHO FALLS, ID 83405-0490
PO BOX 50491, IDAHO FALLS, ID 83405-0491
PO BOX 50492, IDAHO FALLS, ID 83405-0492
PO BOX 50493, IDAHO FALLS, ID 83405-0493
PO BOX 50494, IDAHO FALLS, ID 83405-0494
PO BOX 50495, IDAHO FALLS, ID 83405-0495
PO BOX 50496, IDAHO FALLS, ID 83405-0496
PO BOX 50497, IDAHO FALLS, ID 83405-0497
PO BOX 50498, IDAHO FALLS, ID 83405-0498
PO BOX 50499, IDAHO FALLS, ID 83405-0499
PO BOX 50500, IDAHO FALLS, ID 83405-0500
PO BOX 50501, IDAHO FALLS, ID 83405-0501
PO BOX 50502, IDAHO FALLS, ID 83405-0502
PO BOX 50503, IDAHO FALLS, ID 83405-0503
PO BOX 50504, IDAHO FALLS, ID 83405-0504
PO BOX 50505, IDAHO FALLS, ID 83405-0505
PO BOX 50506, IDAHO FALLS, ID 83405-0506
PO BOX 50507, IDAHO FALLS, ID 83405-0507
PO BOX 50508, IDAHO FALLS, ID 83405-0508
PO BOX 50509, IDAHO FALLS, ID 83405-0509
PO BOX 50510, IDAHO FALLS, ID 83405-0510
PO BOX 50511, IDAHO FALLS, ID 83405-0511
PO BOX 50512, IDAHO FALLS, ID 83405-0512
PO BOX 50513, IDAHO FALLS, ID 83405-0513
PO BOX 50514, IDAHO FALLS, ID 83405-0514
PO BOX 50515, IDAHO FALLS, ID 83405-0515
PO BOX 50516, IDAHO FALLS, ID 83405-0516
PO BOX 50517, IDAHO FALLS, ID 83405-0517
PO BOX 50518, IDAHO FALLS, ID 83405-0518
PO BOX 50519, IDAHO FALLS, ID 83405-0519
PO BOX 50520, IDAHO FALLS, ID 83405-0520
PO BOX 50521, IDAHO FALLS, ID 83405-0521
PO BOX 50522, IDAHO FALLS, ID 83405-0522
PO BOX 50523, IDAHO FALLS, ID 83405-0523
PO BOX 50524, IDAHO FALLS, ID 83405-0524
PO BOX 50525, IDAHO FALLS, ID 83405-0525
PO BOX 50526, IDAHO FALLS, ID 83405-0526
PO BOX 50527, IDAHO FALLS, ID 83405-0527
PO BOX 50528, IDAHO FALLS, ID 83405-0528
PO BOX 50529, IDAHO FALLS, ID 83405-0529
PO BOX 50530, IDAHO FALLS, ID 83405-0530
PO BOX 50531, IDAHO FALLS, ID 83405-0531
PO BOX 50532, IDAHO FALLS, ID 83405-0532
PO BOX 50533, IDAHO FALLS, ID 83405-0533
PO BOX 50534, IDAHO FALLS, ID 83405-0534
PO BOX 50535, IDAHO FALLS, ID 83405-0535
PO BOX 50536, IDAHO FALLS, ID 83405-0536
PO BOX 50537, IDAHO FALLS, ID 83405-0537
PO BOX 50538, IDAHO FALLS, ID 83405-0538
PO BOX 50539, IDAHO FALLS, ID 83405-0539
PO BOX 50540, IDAHO FALLS, ID 83405-0540
PO BOX 50541, IDAHO FALLS, ID 83405-0541
PO BOX 50542, IDAHO FALLS, ID 83405-0542
PO BOX 50543, IDAHO FALLS, ID 83405-0543
PO BOX 50544, IDAHO FALLS, ID 83405-0544
PO BOX 50545, IDAHO FALLS, ID 83405-0545
PO BOX 50546, IDAHO FALLS, ID 83405-0546
PO BOX 50547, IDAHO FALLS, ID 83405-0547
PO BOX 50548, IDAHO FALLS, ID 83405-0548
PO BOX 50549, IDAHO FALLS, ID 83405-0549
PO BOX 50550, IDAHO FALLS, ID 83405-0550
PO BOX 50551, IDAHO FALLS, ID 83405-0551
PO BOX 50552, IDAHO FALLS, ID 83405-0552
PO BOX 50553, IDAHO FALLS, ID 83405-0553
PO BOX 50554, IDAHO FALLS, ID 83405-0554
PO BOX 50555, IDAHO FALLS, ID 83405-0555
PO BOX 50556, IDAHO FALLS, ID 83405-0556
PO BOX 50557, IDAHO FALLS, ID 83405-0557
PO BOX 50558, IDAHO FALLS, ID 83405-0558
PO BOX 50559, IDAHO FALLS, ID 83405-0559
PO BOX 50560, IDAHO FALLS, ID 83405-0560
PO BOX 50561, IDAHO FALLS, ID 83405-0561
PO BOX 50562, IDAHO FALLS, ID 83405-0562
PO BOX 50563, IDAHO FALLS, ID 83405-0563
PO BOX 50564, IDAHO FALLS, ID 83405-0564
PO BOX 50565, IDAHO FALLS, ID 83405-0565
PO BOX 50566, IDAHO FALLS, ID 83405-0566
PO BOX 50567, IDAHO FALLS, ID 83405-0567
PO BOX 50568, IDAHO FALLS, ID 83405-0568
PO BOX 50569, IDAHO FALLS, ID 83405-0569
PO BOX 50570, IDAHO FALLS, ID 83405-0570
PO BOX 50571, IDAHO FALLS, ID 83405-0571
PO BOX 50572, IDAHO FALLS, ID 83405-0572
PO BOX 50573, IDAHO FALLS, ID 83405-0573
PO BOX 50574, IDAHO FALLS, ID 83405-0574
PO BOX 50575, IDAHO FALLS, ID 83405-0575
PO BOX 50576, IDAHO FALLS, ID 83405-0576
PO BOX 50577, IDAHO FALLS, ID 83405-0577
PO BOX 50578, IDAHO FALLS, ID 83405-0578
PO BOX 50579, IDAHO FALLS, ID 83405-0579
PO BOX 50580, IDAHO FALLS, ID 83405-0580
PO BOX 50581, IDAHO FALLS, ID 83405-0581
PO BOX 50582, IDAHO FALLS, ID 83405-0582
PO BOX 50583, IDAHO FALLS, ID 83405-0583
PO BOX 50584, IDAHO FALLS, ID 83405-0584
PO BOX 50585, IDAHO FALLS, ID 83405-0585
PO BOX 50586, IDAHO FALLS, ID 83405-0586
PO BOX 50587, IDAHO FALLS, ID 83405-0587
PO BOX 50588, IDAHO FALLS, ID 83405-0588
PO BOX 50589, IDAHO FALLS, ID 83405-0589
PO BOX 50590, IDAHO FALLS, ID 83405-0590
PO BOX 50591, IDAHO FALLS, ID 83405-0591
PO BOX 50592, IDAHO FALLS, ID 83405-0592
PO BOX 50593, IDAHO FALLS, ID 83405-0593
PO BOX 50594, IDAHO FALLS, ID 83405-0594
PO BOX 50595, IDAHO FALLS, ID 83405-0595
PO BOX 50596, IDAHO FALLS, ID 83405-0596
PO BOX 50597, IDAHO FALLS, ID 83405-0597
PO BOX 50598, IDAHO FALLS, ID 83405-0598
PO BOX 50599, IDAHO FALLS, ID 83405-0599
PO BOX 50600, IDAHO FALLS, ID 83405-0600
PO BOX 50601, IDAHO FALLS, ID 83405-0601
PO BOX 50602, IDAHO FALLS, ID 83405-0602
PO BOX 50603, IDAHO FALLS, ID 83405-0603
PO BOX 50604, IDAHO FALLS, ID 83405-0604
PO BOX 50605, IDAHO FALLS, ID 83405-0605
PO BOX 50606, IDAHO FALLS, ID 83405-0606
PO BOX 50607, IDAHO FALLS, ID 83405-0607
PO BOX 50608, IDAHO FALLS, ID 83405-0608
PO BOX 50609, IDAHO FALLS, ID 83405-0609
PO BOX 50610, IDAHO FALLS, ID 83405-0610
PO BOX 50611, IDAHO FALLS, ID 83405-0611
PO BOX 50612, IDAHO FALLS, ID 83405-0612
PO BOX 50613, IDAHO FALLS, ID 83405-0613
PO BOX 50614, IDAHO FALLS, ID 83405-0614
PO BOX 50615, IDAHO FALLS, ID 83405-0615
PO BOX 50616, IDAHO FALLS, ID 83405-0616
PO BOX 50617, IDAHO FALLS, ID 83405-0617
PO BOX 50618, IDAHO FALLS, ID 83405-0618
PO BOX 50619, IDAHO FALLS, ID 83405-0619
PO BOX 50620, IDAHO FALLS, ID 83405-0620
PO BOX 50621, IDAHO FALLS, ID 83405-0621
PO BOX 50622, IDAHO FALLS, ID 83405-0622
PO BOX 50623, IDAHO FALLS, ID 83405-0623
PO BOX 50624, IDAHO FALLS, ID 83405-0624
PO BOX 50625, IDAHO FALLS, ID 83405-0625
PO BOX 50626, IDAHO FALLS, ID 83405-0626
PO BOX 50627, IDAHO FALLS, ID 83405-0627
PO BOX 50628, IDAHO FALLS, ID 83405-0628
PO BOX 50629, IDAHO FALLS, ID 83405-0629
PO BOX 50630, IDAHO FALLS, ID 83405-0630
PO BOX 50631, IDAHO FALLS, ID 83405-0631
PO BOX 50632, IDAHO FALLS, ID 83405-0632
PO BOX 50633, IDAHO FALLS, ID 83405-0633
PO BOX 50634, IDAHO FALLS, ID 83405-0634
PO BOX 50635, IDAHO FALLS, ID 83405-0635
PO BOX 50636, IDAHO FALLS, ID 83405-0636
PO BOX 50637, IDAHO FALLS, ID 83405-0637
PO BOX 50638, IDAHO FALLS, ID 83405-0638
PO BOX 50639, IDAHO FALLS, ID 83405-0639
PO BOX 50640, IDAHO FALLS, ID 83405-0640
PO BOX 50641, IDAHO FALLS, ID 83405-0641
PO BOX 50642, IDAHO FALLS, ID 83405-0642
PO BOX 50643, IDAHO FALLS, ID 83405-0643
PO BOX 50644, IDAHO FALLS, ID 83405-0644
PO BOX 50645, IDAHO FALLS, ID 83405-0645
PO BOX 50646, IDAHO FALLS, ID 83405-0646
PO BOX 50647, IDAHO FALLS, ID 83405-0647
PO BOX 50648, IDAHO FALLS, ID 83405-0648
PO BOX 50649, IDAHO FALLS, ID 83405-0649
PO BOX 50650, IDAHO FALLS, ID 83405-0650
PO BOX 50651, IDAHO FALLS, ID 83405-0651
PO BOX 50652, IDAHO FALLS, ID 83405-0652
PO BOX 50653, IDAHO FALLS, ID 83405-0653
PO BOX 50654, IDAHO FALLS, ID 83405-0654
PO BOX 50655, IDAHO FALLS, ID 83405-0655
PO BOX 50656, IDAHO FALLS, ID 83405-0656
PO BOX 50657, IDAHO FALLS, ID 83405-0657
PO BOX 50658, IDAHO FALLS, ID 83405-0658
PO BOX 50659, IDAHO FALLS, ID 83405-0659
PO BOX 50660, IDAHO FALLS, ID 83405-0660
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